Monographs Details: Serjania hatschbachii Ferrucci
Authority: Acevedo-Rodríguez, Pedro. 1993. Systematics of Serjania (Sapindaceae) Part I: A Revision of Serjania Sect. Platycoccus. Mem. New York Bot. Gard. 67: 1-91.
Description:Species Description - Semi-woody vine. Stems ca. 0.6 cm in diam., subterete, with 6 prominent ribs, sparsely covered with 2-3 mm long, setulose yellowish hairs, glabrescent, spiny projections often present; cross section of stem with central, subterete, large stele and (3-)4-5 peripheral, smaller, terete or subterete steles, these not included in central one. Stipules deltoid to subulate, ca. 1 mm long, with setulose and glandular hairs on margin. Leaves biternate; petioles and rachis not winged, subterete terete, adaxially furrowed, densely to sparsely covered with same indument as stems, petioles shorter than primary rachis; leaflets chartaceous, with acuminate and mucronate apex, the terminal leaflet larger, lanceolate or elliptic, (3-)6-11 x 2.1-5.2 cm, with long attenuate base, the lateral leaflets lanceolate or elliptic, (3-)4.2-7.5(-9) x 1.6-3.5(-4.2) cm, with rounded base, sessile, both surfaces glabrous, except for a few hairs on midvein of upper surface, the margins revolute, scarious, remotely and acutely serrate, ciliate when young, the teeth glandular, the veins semicraspedodromus, the primary and secondary veins slightly prominent on lower surfaces. Inflorescence axillary, longer than subtending leaf; axis 4-angular, glabrous, usually twitting; rachis subterete, glabrous and striate; bracts and bracteoles subulate, ca. 1 mm long, margins with glandular hairs; cincinni whorled, 0.8-1.2 cm long, glabrous, 5- to 7-flowered; pedicels 2-4 mm long, articulate close to base, sparsely covered with minute, whitish hairs. Flowers with sepals 5, obtuse at apex, the outer sepals 1.7 mm long, ovate, the inner sepals 2.5 mm long, oblong or widely ovate, third and fifth sepals free; petals 3-3.5 mm long, spatulate, sparsely covered with minute papillae on adaxial surface, the apex rounded; appendages of central petals cream color, ca. 2.5 mm long, hood-shaped, with fleshy, crown-shaped apex and ciliate margins, the appendages of lateral petals 3 m m long, with slightly fleshy apex and ciliate margins; disk with four glands, ca. 0.7 mm long, ovate in outline, with obtuse apex; torus reduced; filaments sparsely covered with white, inflexed hairs, the anthers ellipsoid, ca. 0.4 mm long. Fruits 2.2-2.5 cm long, heartshaped in outline, glabrous, the base obtuse, the apex retuse; locules flattened, with slightly prominent veins; wings reduced toward the base. Seeds flattened, lenticular, light brown, 7 mm long; embryo with biplicate, smaller, adaxial cotyledon and curved, larger abaxial cotyledon.

Discussion:Serjania hatschbachii is morphologically similar to S. tenuis. However, it differs from this species by its biternate (vs. temate) leaves, sparsely hirsute stems (vs. glabrous), cross section of stem with five to seven peripheral steles (vs. three) and fruits with a very reduced wing. This species honors Gert Hatschbach, who made the only collections of tiiis species as well as of many other interesting plants from southeastem Brazil.